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• <br /> • • Rational Method Calculation for Conveyance Analysis <br /> Project: Gibson SP <br /> • <br /> Proj. No.: 15-0403 <br /> Rational Equation : QR= CIRA <br /> Cc= (CjA1 + C2A2+ ... + CnAn)/At <br /> • Cdf= 0.10 Dense Forest Adf= 0.00 ac <br /> Cif= 0.15 Light Forest Alf= 0.00 ac <br /> • C,= 0.20 Pasture A = 0.00 ac <br /> C,= 0.25 Lawns A1= 0.00 ac <br /> Cpl= 0.30 Playground At= 0.00 ac <br /> C9 = 0.80 Gravel Ag= 0.00 ac <br /> Cpav= 0.90 Pavement/Roof Apav= 0.97 ac <br /> CO3,= 1.00 Open Water A.= 0.00 ac <br /> At= 0.97 ac <br /> • Cc= 0.90 <br /> = m/T^n <br /> m 10.07 100-yr <br /> n 0.586 100-yr <br /> Tc=Ti +T2+ ... +Tn <br /> Length kR so Velocity <br /> Tdf= 0.00 0 2.5 0 0.00 fps <br /> T1f= ....:0.00 0 .2.5 0 0.00 fps <br /> Tp= 0.00 0 4.7 0 0.00 fps <br /> T1= 0.00 0 7.0 0 0.00 fps <br /> Tp = 0.00 0 10.1 0 0.00 fps <br /> T9 = 0.00 0 10.1 0 0.00 fps <br /> Tpav= 1.18 200 20.0 0.02 2.83 fps <br /> T.= 0.00 0 20.0 0 0.00 fps <br /> Tc= 6.30 min. <br /> iR= 3.42 "/hr <br /> QR= 2.97 cfs <br />